Steam-boiler.



U. BERETTA & B. GIANESE. STEAM BOILER. APPLIUATION FILED 111111.19,1912.

1,084,782, Patented Jan. 20, 1914.

UBALDO BERETTA AND BENVENUTO GIANESE, OF GENOA, ITALY.

STEAM-BOILER.

To all whom t may concern.'

Be it known that we, UBALDO BERETTA and BENVENUTO GIANnsn, both subjectsof the King oit Italy, residing at Genoa, Ttaly, have invented certainnew and useful mprovements in Steam-Boilers, ot' which the follow ing isa specification.

Our invention has 'for its object to provide an apparatus to be used insteam boilers ot' every type for improving the combustion.

It is well known that part of the volatile material contained in thecoal is not consumed but leaves the chimney without contributing in anyway to the etliciency ot the boiler.

It is the object ot' the present invention t-o construct an apparatuspermitting the products of combustion to combine with the oxygen ot theatmospheric air introduced into the combustion chamber and of increasingin this manner the etliciency of the coal burnt on the grate.

In the accompanying drawing Figure 1 is a longitudinal vertical sectionthrough part of a boiler embodying our invention. Fig. 2 is alongitudinal horizontal section thereof, and Fig. 3 is a detail viewillustrating the manner of securing the pipes and staii's. Fig. 4l is asection on line 3?, Fig. 2, and Fig. 5 is a detail top plan view of astaff and plates.

Tnto the secondary combustion chamber otl a boiler as shown in Fig. 1 aplurality of plate elements B composed of refractory material isintroduced. These elements become incandescent at about-1400o F. andproduce a better chemical affinity between the products of combustionand the oxygen of the atmospheric air. These plate elements aresupported by the staffs A composed of refractory material (principallymagnesia silicates), of about 3600D F. lire resistance. The staffs A aresecured in the pipe T3 and eX- tend through the pipe Gr4 as shown inFig. 3.

The oxygen of the atmospheric air which enters a chemical combinationwith the volatile materials oit the coal is introduced by means of thepipes T1 which traverse the combustion chamber and are arranged withintwo heating pipes T2 of the furnace (see Figs. 1 and 2). The airentering into the pipes T1 is heated by the influence of the boilerwater and while traveling through the pipes T3 its temperature isincreased, whereafter it passes into the secondary combustionSpecification of Letters Patent.

Application filed March 19, 1912.

lateuted Jan. 20. 1914.

Serial No. 684,735.

chamber and passes the open holes in the pipes T5 and TA1 opening intopipes T. A valve V at one end of the pipe T1 controls the regulation oithe air which is supplied. The two pipe pieces T4 are secured to theheating pipes by means oi.' a tie-rod L, nut and lock nut C and D. As asupplementary means t'or more intimately mixing the oxygen of theatmospheric air and the combustion gases a certain quantity of air isalso introduced and distributed by means of a flue K.

It is generally known that the gases leaving the furnace at a speed ofabout 16 to 20 feet per second are rapidly contacting with the tubeplate and consequently suffer a con siderable loss of temperature ofabout 930 F. and become well adapted ior the production oi' soot. Thisis a frequent occurrence especially with the ordinary marine boilers andlocomotive boilers.

Vith the present appliance the gases are obliged to travel a longerdistance within the combustion chamber heilig restrained by saidappliance and obliged to pass across it. Thus a supplemental combinationof the products of combustion and the oxygen of the atmospheric air isproduced in the combustion chamber ot' a boiler, which combinationproduces an increase oli' temperature and a considerable decrease in thesmoke developed and consequently an important increase in the efficiencyof the boiler.

It is clear that the stati' A may be made oi any suitable material,shape, and may be differently arranged, and, that the elements B may besubstituted by elements of any other suitable incandescent material andiinally also the pipes T1, T3, and T" may be arranged in any dierentsuitable way without departing from the scope of the present invention.

We claim:

1. A tubular boiler having a passage for the products of combustion, incombination with upper and lower pipes extending from the tubes of theboiler' into said passage and provided with openings discharging airinto said passage, a plurality of perforated circular plate elements ofrefractory material interposed in the path of the products of combustionto retard the passage of the same and spaced from each other, inclinedstais of refractory material mounted on said pipes and extending acrossthe path of the prodoal, and flat perforated plates of a refractorymaterial mounted on said staffs in spaced relation With respect to eaohother, substantially as described.

In testimony whereof We affix our signatures in presence of twoWitnesses.

UBALDO BERETTA. BENVENUTO GIANESE.

nets 0f combustion for supporting said plate elements, substantially asand for the purpose set forth.

2. A tubular boiler having a passage for the products of combustion, incombination with upper and lower pipes extending from the tubes of theboiler into said passage and provided with openings discharging air intosaid passage, stas mounted on saidv pipes `Witnesses: andextendingaoross the path of the prod- JAMES B.l YOUNG, uots ofcombustion at an angle to the Verti- C. A. YEMAN.`

Copiers of this patent :may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

